Galactic synchrotron emissivity measurements between 250° MWA
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Author
Su, H.
Hurley-Walker, N.
Jackson, C. A.
McClure-Griffiths, N. M.
Tingay, S. J.
Hindson, L.
Hancock, P.
Wayth, R. B.
Gaensler, B. M.
Staveley-Smith, L.
Morgan, J.
Johnston-Hollitt, M.
Lenc, E.
Bell, M. E.
Callingham, J. R.
Dwarkanath, K. S.
For, B. Q.
Kapińska, A. D.
McKinley, B.
Offringa, A. R.
Procopio, P.
Wu, C.
Zheng, Q.
Attention
2299/17665
Abstract
Synchrotron emission pervades the Galactic plane at low radio frequencies, originating from cosmic ray electrons interacting with the Galactic magnetic field. Using a low-frequency radio telescope, the Murchison Widefield Array (MWA), we measure the free-free absorption of this Galactic synchrotron emission by intervening HII regions along the line of sight. These absorption measurements allow us to calculate the Galactic cosmic-ray electron emissivity behind and in front of 47 detected HII regions in the region $250^\circ